Alternative methods would combine the whole array stream of data at the  fusion center by using
maximum likelihood beamforming for multiple arrays [1]}, [2]} and localize the arrays in an ad hoc network [3]}. In our approach, where the DOAs are processed at the individual arrays, we benefit from transmitting just the DOA stream. This requires less bandwidth than using the raw array output. In terms of privacy this is a huge improvement as no signals are transmitted to the fusion center.
In a fusion center multiple DOAs can be used for localization based on known array positions[4]}.
